GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 19 Oct 2019, 13:39

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

In the table above, is z = 20q ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
Joined: 07 Feb 2010
Posts: 116
In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 02 Nov 2010, 06:21
1
13
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (01:43) correct 37% (01:32) wrong based on 355 sessions

HideShow timer Statistics

Image
In the table above, is z = 20q ?

(1) q = 3
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table

Attachment:
qqqq.png
qqqq.png [ 3.18 KiB | Viewed 6337 times ]
Most Helpful Expert Reply
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58445
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 02 Nov 2010, 06:39
7
1
anilnandyala wrote:
please some one explain this, thanks in advance


Image
In the table above, is z = 20q?

(1) q = 3 --> we don't know the relationship between the letters. Not sufficient.
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table --> we can express all letters below and to the right of q in terms of q and eventually we'll get z in terms of q and see whether z=20q is true. Sufficient.

Answer: B.

Just to illustrate:
Attachment:
untitled.PNG
untitled.PNG [ 2.83 KiB | Viewed 6924 times ]

_________________
General Discussion
Manager
Manager
avatar
Joined: 06 Aug 2010
Posts: 153
Location: Boston
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 02 Nov 2010, 06:38
2
2
1) q=3 tells us nothing about z. Insufficient.

2) From this, we have:

\(z=w+y\)
\(w+y = (t+v) + (v+x) = t+2v+x\)
\(t+2v+x = (q+s) + 2(s+u) + (u+q) = 2q + 3s + 3u\)
\(2q + 3s + 3u = 2q + 3(q+r) + 3(r+q) = 8q + 6r\)
\(8q + 6r = 8q + 6(q+q) = 20q\)

So z = 20q. Sufficient.
Director
Director
avatar
Joined: 29 Nov 2012
Posts: 695
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 29 Jun 2013, 08:01
1
How common are such questions on the GMAT and what's the difficulty level if this question shows up as Problem solving rather than DS?

Bunuel's approach is easier to digest :)
Manager
Manager
User avatar
Joined: 06 Jan 2015
Posts: 58
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 20 Jan 2015, 09:10
I got the answer right, but it took me arounf 4 mins.
Lots of equations to set up!
_________________
"No pain, no gain
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15281
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 20 Jan 2015, 20:26
1
Hi All,

GMAT questions can often be solved using variety of different approaches (and even the "math" can be done in different ways), so you sometimes have to think about what is the easiest way to get to the answer using the given information (and using the wording of the specific question to your advantage).

Here, we're asked if Z = 20Q, which is a relatively "strange" thing to ask. Maybe there's a pattern to figuring out that exact question....

Everyone seems to have interpreted Fact 1 correctly, so I won't rehash that work here.

In Fact 2, we're told that each value that is NOT a Q is equal to the SUM of the value directly to the LEFT and directly ABOVE it. Using the table, we start with....

Q Q Q Q
Q
Q
Q

From here, let's do the second row, but don't write down a thick equation for every box - just talk through the math....

Q + Q = 2Q

Q Q Q Q
Q 2Q
Q
Q

Q + 2Q = 3Q

Q Q Q Q
Q 2Q 3Q
Q
Q

Q + 3Q = 4Q

Q Q Q Q
Q 2Q 3Q 4Q
Q
Q

You can easily fill in the next two rows without that much effort - just add up the values to the immediate LEFT and ABOVE....

Q Q Q Q
Q 2Q 3Q 4Q
Q 3Q 6Q 10Q
Q 4Q 10Q 20Q

When a question takes you "too long" to answer, sometimes what you have to focus on is how YOU approached the task. Could you have organized your work better? Could you have done the math in a different way? Could you have used a different approach entirely? Etc. As such, it's often beneficial to redo past questions (even if you got the questions correct) so that you can master other approaches and ultimately be able to approach questions in multiple ways. That flexibility in thinking will be beneficial on Test Day.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Intern
Intern
User avatar
B
Joined: 30 Jun 2017
Posts: 13
Location: India
Concentration: Technology, General Management
WE: Consulting (Computer Software)
GMAT ToolKit User
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 12 Sep 2017, 00:52
Bunuel wrote:
anilnandyala wrote:
please some one explain this, thanks in advance


Image
In the table above, is z = 20q?

(1) q = 3 --> we don't know the relationship between the letters. Not sufficient.
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table --> we can express all letters below and to the right of q in terms of q and eventually we'll get z in terms of q and see whether z=20q is true. Sufficient.

Answer: B.

Just to illustrate:
Attachment:
untitled.PNG


Hi Bunuel,

I think it's a silly question, but if z=12Q after the derivation, then also the answer would be B as the data is sufficient to say that z is not equal to 20Q, just a general query.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58445
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 12 Sep 2017, 00:57
1
SinhaS wrote:
Bunuel wrote:
anilnandyala wrote:
please some one explain this, thanks in advance


Image
In the table above, is z = 20q?

(1) q = 3 --> we don't know the relationship between the letters. Not sufficient.
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table --> we can express all letters below and to the right of q in terms of q and eventually we'll get z in terms of q and see whether z=20q is true. Sufficient.

Answer: B.

Just to illustrate:
Attachment:
untitled.PNG


Hi Bunuel,

I think it's a silly question, but if z=12Q after the derivation, then also the answer would be B as the data is sufficient to say that z is not equal to 20Q, just a general query.


Yes. In a Yes/No Data Sufficiency questions, statement(s) is sufficient if the answer is “always yes” or “always no” while a statement(s) is insufficient if the answer is "sometimes yes" and "sometimes no".

When a DS question asks about the value of some variable, then the statement(s) is sufficient ONLY if you can get the single numerical value of this variable.

Hope it helps.
_________________
Senior Manager
Senior Manager
User avatar
P
Joined: 29 Jun 2017
Posts: 424
GPA: 4
WE: Engineering (Transportation)
GMAT ToolKit User Reviews Badge
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 12 Sep 2017, 01:15
anilnandyala wrote:
Attachment:
qqqq.png
In the table above, is z = 20q?

(1) q = 3
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table



1) q=3 => insufficient
2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table

q-q--q--q
q-2q-3q-4q
q-3q-6q-10q
q-4q-10q-20q


Clearly z=20q

Option B is the correct answer
_________________
Give Kudos for correct answer and/or if you like the solution.
Veritas Prep GMAT Instructor
User avatar
V
Joined: 16 Oct 2010
Posts: 9706
Location: Pune, India
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 12 Sep 2017, 03:50
1
anilnandyala wrote:
Attachment:
qqqq.png
In the table above, is z = 20q?

(1) q = 3
(2) Each value in the table other than q is equal to the sum of the value immediately above it in the table and the value immediately to its left in the table


Such a question is not hard if you choose the right starting point.
Statement 1 is obviously not sufficient since it doesn't give the relation between variables.
So look at Statement 2. You want to see if you can get z in terms of q.
Note that r on the edge can be written in terms of q only.
r = 2q
So s = 3q, t = 4q.
Similarly, we will get u, v and w in terms of q and eventually x, y and z in terms of q.

So we will know whether z is equal to 20q and statement 2 alone will be sufficient.

Answer (B)
_________________
Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13275
Re: In the table above, is z = 20q ?  [#permalink]

Show Tags

New post 16 Oct 2019, 05:25
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: In the table above, is z = 20q ?   [#permalink] 16 Oct 2019, 05:25
Display posts from previous: Sort by

In the table above, is z = 20q ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne